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Business Segment (Tables)
3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Summary of Information by Business Segment
  Three Months Ended
  March 31, 2021March 31, 2020
 Total Assets atExternal RevenuesIncome (Loss)External RevenuesIncome (Loss)
(Millions of dollars)March 31, 2021
Marketing$3,567.3 $3,537.1 $80.4 $3,184.7 $100.9 
Corporate and other assets413.3 — (25.1)0.1 (11.6)
Total$3,980.6 $3,537.1 $55.3 $3,184.8 $89.3